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120 mm (4.7 in)
- Standard CDs have a diameter of 120 mm (4.7 in), and are designed to hold up to 74 minutes of uncompressed stereo digital audio or about 650 MiB (681,574,400 bytes) of data.
en.wikipedia.org/wiki/Compact_disc
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By far, the most common is 120 millimetres (4.7 in) in diameter, with a 74-, 80, 90, or 99-minute audio capacity and a 650, 700, 800, or 870 MiB (737,280,000-byte) data capacity. Discs are 1.2 millimetres (0.047 in) thick, with a 15 millimetres (0.59 in) center hole.
1 day ago · A standard CD is 120 mm (4.75 inch) in diameter and 1.2 mm (0.05 inch) thick. It is composed of a clear polycarbonate plastic substrate, a reflective metallic layer, and a clear protective coating of acrylic plastic.
- The Editors of Encyclopaedia Britannica
Mar 6, 2024 · The incredibly small dimensions of the bumps make the spiral track on a compact disc CD extremely long. If you could lift the data track off a CD and stretch it out into a straight line, it would be 0.5 microns wide and almost 3.5 miles (5 km) long!
Jul 28, 2023 · What is a compact disc? Compact discs are small plastic discs used to store digital information, such as music, video, etc. When was the compact disc invented? October 1982. How much did compact discs cost? $1,000 in 1982. What are compact discs used for? Compact discs were initially used for audio and data storage. What is an example of a ...
A compact disc is a portable storage medium that can record, store and play back audio, video and other data in digital form. A standard compact disc measures 4.7 inches, or 120 millimeters (mm), across, is 1.2 mm thick, weighs between 15 grams and 20 grams, and has a capacity of 80 minutes of audio, or 650 megabytes (MB) to 700 MB of data. A ...
Aug 29, 2023 · 3. What is size of a compact disc? Compact discs are majorly 1.2mm(0.05 Inch) thick with a diameter of CD is 120mm(4.75 Inch).
The size of the CD has an interesting story to it: Philips’ idea of a 115mm CD had to be shelved because Sony insisted that the longest musical performance should fit on to the disc, which was Beethoven’s entire 9th Symphony, at 74 minutes, and the size of the CD was increased to 120mm.